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Subject[RFC v2 PATCH 3/9] Ksplice: Add functions for walking kallsyms symbols
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From: Anders Kaseorg <andersk@mit.edu>

kallsyms_lookup_name only returns the first match that it finds.
Ksplice needs information about all symbols with a given name in order
to correctly resolve local symbols.

kallsyms_on_each_symbol provides a generic mechanism for iterating
over the kallsyms table.

Signed-off-by: Anders Kaseorg <andersk@mit.edu>
---
include/linux/kallsyms.h | 13 +++++++++++++
include/linux/module.h | 12 ++++++++++++
kernel/kallsyms.c | 18 ++++++++++++++++++
kernel/module.c | 19 +++++++++++++++++++
4 files changed, 62 insertions(+), 0 deletions(-)
diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h
index b961448..b8ee4d2 100644
--- a/include/linux/kallsyms.h
+++ b/include/linux/kallsyms.h
@@ -17,6 +17,11 @@
/* Lookup the address for a symbol. Returns 0 if not found. */
unsigned long kallsyms_lookup_name(const char *name);

+/* Call a function on each kallsyms symbol in the core kernel */
+int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *,
+ unsigned long),
+ void *data);
+
extern int kallsyms_lookup_size_offset(unsigned long addr,
unsigned long *symbolsize,
unsigned long *offset);
@@ -43,6 +48,14 @@ static inline unsigned long kallsyms_lookup_name(const char *name)
return 0;
}

+static inline int kallsyms_on_each_symbol(int (*fn)(void *, const char *,
+ struct module *,
+ unsigned long),
+ void *data)
+{
+ return 0;
+}
+
static inline int kallsyms_lookup_size_offset(unsigned long addr,
unsigned long *symbolsize,
unsigned long *offset)
diff --git a/include/linux/module.h b/include/linux/module.h
index b7cdfb4..cd982cd 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -374,6 +374,10 @@ int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
/* Look for this name: can be of form module:name. */
unsigned long module_kallsyms_lookup_name(const char *name);

+int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
+ struct module *, unsigned long),
+ void *data);
+
extern void __module_put_and_exit(struct module *mod, long code)
__attribute__((noreturn));
#define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code);
@@ -539,6 +543,14 @@ static inline unsigned long module_kallsyms_lookup_name(const char *name)
return 0;
}

+static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
+ struct module *,
+ unsigned long),
+ void *data)
+{
+ return 0;
+}
+
static inline int register_module_notifier(struct notifier_block * nb)
{
/* no events will happen anyway, so this can always succeed */
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 38fc10a..47d3e94 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -161,6 +161,24 @@ unsigned long kallsyms_lookup_name(const char *name)
return module_kallsyms_lookup_name(name);
}

+int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *,
+ unsigned long),
+ void *data)
+{
+ char namebuf[KSYM_NAME_LEN];
+ unsigned long i;
+ unsigned int off;
+ int ret;
+
+ for (i = 0, off = 0; i < kallsyms_num_syms; i++) {
+ off = kallsyms_expand_symbol(off, namebuf);
+ ret = fn(data, namebuf, NULL, kallsyms_addresses[i]);
+ if (ret != 0)
+ return ret;
+ }
+ return module_kallsyms_on_each_symbol(fn, data);
+}
+
static unsigned long get_symbol_pos(unsigned long addr,
unsigned long *symbolsize,
unsigned long *offset)
diff --git a/kernel/module.c b/kernel/module.c
index dda2f80..343c8f8 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2523,6 +2523,25 @@ unsigned long module_kallsyms_lookup_name(const char *name)
preempt_enable();
return ret;
}
+
+int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
+ struct module *, unsigned long),
+ void *data)
+{
+ struct module *mod;
+ unsigned int i;
+ int ret;
+
+ list_for_each_entry(mod, &modules, list) {
+ for (i = 0; i < mod->num_symtab; i++) {
+ ret = fn(data, mod->strtab + mod->symtab[i].st_name,
+ mod, mod->symtab[i].st_value);
+ if (ret != 0)
+ return ret;
+ }
+ }
+ return 0;
+}
#endif /* CONFIG_KALLSYMS */

/* Called by the /proc file system to return a list of modules. */
--
1.5.4.3


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